Assume this program has been compiled into foo.

include

int main(int argc, char *) {

for(; argc > 1; argc--){
if(0 == fork()){
   (void) fork();
   }
}
return 0;

}

How many child processes are created for the following invocations. 1) - ./foo 2) - ./foo a 3) -./foo a b 4) - ./foo a b c 5) - ./foo a b c d